So far, I have not sold any commissions that are not made up of acrylic yarn, so this should not be a concern in terms of what fiber your piece includes. This may change in the future since I'm on a big sock kick right now. I have given a couple gifts that include wool and cotton yarn. If you're not sure, feel free to send me an email or other message with a picture of the garment and I'll let you know what fiber it is if I can remember. If you order or have ordered a commission from me, I will/did include information on what fiber it is.
For acrylic yarn: Synthetic yarns mean that you should keep your piece away from heat to avoid the plastic melting. Generally speaking, synthetic fibers start to become damaged at about 200 degrees Fahrenheit, so a hot day won't damage your piece, but you should avoid sticking it in the dryer. Instead, use a blow dryer or let it air dry.
Since this isn't amigurumi and thus is touching your gross human body more, I do recommend that you wash it frequently. You can toss garments or blankets in the washing machine. Lay them out flat afterwards to air-dry, or use a blow dryer so you can control the heat level. If you want to play it safe, you can handwash it in cold water with a mild detergent.
For wool yarn: I really recommend handwashing wool yarn. You can use a wool detergent in cool or lukewarm water, and leave the garment to soak. Do NOT scrub at the garment or try to wring it out. Make sure that you leave it to dry flat, or it may lose its shape or stretch. You can try machine washing in a laundry bag with cool water, but I wouldn't recommend it and you would be doing that at your own risk.
Cotton yarn is durable, and dries pretty easily. You can throw it in the washing machine and the dryer. If you want to play it safe, you can handwash it in cold water with a mild detergent and lay it out to dry.
If some yarn comes loose, you can use a tapestry needle to weave it back in again.